ISO Rust Grade Book - Senze-Instruments

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Process & Quality Control

ISO Rust Grade Book

Coatings & Industry > Corrosion + Ageing
The Rust Grade Book specifies a series of Rust Grades and Preparation  Grades of blast-cleaned steel surfaces.  

The various Grades are defined  by written descriptions together with photographs.
The Book  identifies four levels (designated as Rust Grades) of mill scale and  rust that are commonly found on surfaces of uncoated erected steel and  steel held in stock.  
It also identifies certain degrees of visual  cleanliness (designated as Preparation Grades) after surface preparation  of uncoated steel surfaces and of steel surfaces after overall removal  of any previous coating.
ISO 8501-1: Preparation of steel substrates before application of paints and related products.
Visual assessment of surface cleanliness.
Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings.

The Rust Grade Book specifies a series of Rust Grades and Preparation Grades of blast-cleaned steel surfaces.  The various Grades are defined by written descriptions together with photographs.
The Book identifies four levels (designated as Rust Grades) of mill scale and rust that are commonly found on surfaces of uncoated erected steel and steel held in stock.  It also identifies certain degrees of visual Cleanliness (designated as Preparation Grades) after surface preparation of uncoated steel surfaces and of steel surfaces after overall removal of any previous coating.
Four Rust Grades, designated A, B, C, and D respectively are specified.
There are also fourteen Preparation Grades by blast-cleaning, indicating the degree of cleaning, together with detailed descriptions of the surface appearance to the following Sa Grades.

  • Grade Sa 1. Light blast-cleaning.
  • Grade Sa 2. Thorough blast-cleaning.
  • Grade Sa 2½.Very thorough blast-cleaning.
  • Grade Sa 3. Blast-cleaning to visually clean steel
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